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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Line Items]          
Effective tax rate expense (benefit) 18.10% 68.50% 26.70% 22.90%  
Income tax benefit, result of CARES act of 2020       $ 7,400  
Income tax expense, result of Alabama business tax competitiveness act     $ 1,600    
Deferred tax assets, gross $ 56,941   56,941   $ 55,687
Valuation allowance established against deferred tax assets 47,776   47,776   45,818
Deferred tax assets 9,165   9,165   9,869
Domestic [Member]          
Income Tax Disclosure [Line Items]          
Valuation allowance established against deferred tax assets     1,600    
Deferred tax assets, gross 45,383   45,383   43,791
Valuation allowance established against deferred tax assets $ 45,383   $ 45,383   $ 43,791